#ifndef _ORANGES_CONST_H_
#define _ORANGES_CONST_H_

/* EXTERN is defined as extern except in global.c */
#define EXTERN extern

/* 函数类型 */
#define PUBLIC      /* PUBLIC is the opposite of PRIVATE */
#define PRIVATE static  /* PRIVATE x limits the scope of x */

/* GDT 和 IDT 中描述符的个数 */
#define GDT_SIZE    128
#define IDT_SIZE    256

/* 权限 */
#define PRIVILEGE_KRNL  0
#define PRIVILEGE_TASK  1
#define PRIVILEGE_USER  3

/* 8259A interrupt controller ports. */
#define INT_M_CTL       0x20 /* I/O port for interrupt controller <Master> */
#define INT_M_CTLMASK   0x21 /* setting bits in this port disables ints <Master> */
#define INT_S_CTL       0xA0 /* I/O port for second interrupt controller<Slave> */
#define INT_S_CTLMASK   0xA1 /* setting bits in this port disables ints <Slave> */

#endif /* _ORANGES_CONST_H_ */
